import java.nio.charset.StandardCharsets; 
import java.util.zip.Deflater; 

public class DeflaterSmallBufferBug 
{ 
    public static void main(String[] args) 
    { 
        boolean nowrap = true; 
        Deflater deflater = new Deflater(Deflater.DEFAULT_COMPRESSION,nowrap); 

        byte[] input = "Hello".getBytes(StandardCharsets.UTF_8); 

        System.out.printf("input is %,d bytes - %s%n",input.length,getHex(input,0,input.length)); 

        deflater.setInput(input); 

        byte[] output = new byte[input.length]; 

        // break out of infinite loop seen with bug 
        int maxloops = 10; 

        // Compress the data 
        while (maxloops-- > 0) 
        { 
            int compressed = deflater.deflate(output,0,output.length,Deflater.SYNC_FLUSH); 
            System.out.printf("compressed %,d bytes - %s%n",compressed,getHex(output,0,compressed)); 

            if (compressed < output.length) 
            { 
                System.out.printf("Compress success"); 
                return; 
            } 
        } 

        System.out.printf("Exited compress (maxloops left %d)%n",maxloops); 
    } 

    private static String getHex(byte[] buf, int offset, int len) 
    { 
        StringBuilder hex = new StringBuilder(); 
        hex.append('['); 
        for (int i = offset; i < (offset + len); i++) 
        { 
            if (i > offset) 
            { 
                hex.append(' '); 
            } 
            hex.append(String.format("%02X",buf[i])); 
        } 
        hex.append(']'); 
        return hex.toString(); 
    } 
}